Sound-intensifier for telephone-mouthpieces and the like.



H. FOSS.

SOUND INTENSIFIBR FOB TELEPHONE MOUTHPIEGES AND THE LIKE.

APPLICATION FILED AUG. 24, 1909.

1,01 1,045, I Patented De0.5, 1911.

Invent nto Att 5 i 11 21 reduced in diameter "UNITED STATES PATENT OFFICE.

HERMAN FOSS, ()F DOMBAAS, NORWAY.

SOUI D-INTENSIFIER FOR TELEPHONE-MOUTHIIECES AND THE LIKE.

implication filCil August 24,

To all whom it may concern: 1

it known that l. HERMAN Foss, a eiti /nn of Norway, and resident of-Domhans, Giuiln'nncliilnlllli, in the Kingdon'i of Norway, have inventecl certain new and useful ,ln'iproi'enlenis in Sound Iniensifiers for Tele mono-Mouthpieces and the Like, of which the following is a specification.

This invention relates to arrangements for niieeiively increasing the action of the sound waves on a, microphone membrane, i" by improving the cleari'iess of speech, more particularly in the ease of telephoning over long distances.

The invention may also be applied to other sii'nil 1 sound transmitting appz-irntus, and consisls in having the mouth-piece reduced, ui' its open enilyio a single inn-row opening; The mouth-piece thus forms 11.

pizietien ly closed sound box which eonnnu nientes n ihe niemh. ne easing i'hi'ongh similar single narrow opening. Experiniei'ils have shown (hut ihe sound is eonsiclen zihly iinicnsiiiel h v' such armn cinenh The inven'lien n iso consists ieiinpi'oved scuiul ini'ensifying arrangements heneiiintfiieii described and claimed.

in the nceompmiying (ii-swin s Flushed-- ing the invention by way of example, Figure ."hows the lower end of a l'elephone :ippzi with a mouth-piece of in'i new oonsi'i'm'xizion. g; is a side elevation shew- :1 ineui li-'piece of spherical shape. Figs. 3 and. 4- ire, respectively, a side elevzii'ion and :1 front view of 2m m ljusiinhlc. spherical ..nch uselh instenu of being iorine in LllC usual manner as sin'lwi'i the (l.\' t'i.e(l lines I near ihe open end -3-, the eonlirncieci part ,---:'3- forming a. single and compnraiively-neri'ow Specification of Letters Patent.

Pnnenieii Dec. 5, 191

1809. Serial No. 51%,3915.

opening which leads to he sound box proper of the niouih-piece. snid souncl hox lminp; also connected through a similar single narrow opening -G with ihe membrane ensing 1. It has been found that, by this urrangeznenl', the nciion oi the sound waves on the membrane is eonsidei-nhly increased as comnai'eel wiih lhe usunl n'iouih-piecc.

F I 2 shows a modified form of construction similar to (the oonstruoi'ion shown. in Fig. 1, the sound hex proper being spherically shaped. This shape has proved very satisfactory, and is preferred for that shown in Fig. 1.,

Figs. 3 and 4- show a form of construction of an ncljusiahle inoui'ih-piece of spherical form, as above (lescrihel wil'h iO'FOYEllCC to Fig. 2. The spherically shaped inoui'hpiece is conneci'wl wilh the incmh nne cnsinn 1l-- hy means of u heui' tuhe ee-- wnich can be rotated at -21 rind --22---, so that by i'oi'ni'ing s: l(l iuhe (he opening of ihe mouth-piece may assume any position between the two QXi'lOlUQ positions indicated by deified lines.

Hn'vinn' now (inscribed my invention. what (-lniin new and desire to secui'e h ileu en; i

in mouil'i-piece 'foi iele 'ihones er the like, spherically shu 'ieci sound hex having a single contineleii opening: lending to "l'he nieuihznne ("using and :1 single conii-nciimfl opening; connecieil wiih the nhnospheie ftKl the axis oi. which formii'ig an angle of? about 90 wiih ihni of the first incinioi'ied opening.

in tcsizii'nony wl'iereof i have signed inf, name in (his specificniion in the presence of {we suhscrihing wii'nesses,

HERIVIAN FOSS. 

